Outer sheath



FIG. 1 is a top perspective view of an outer sheath;

FIG. 2 is a plan view of a front end of the outer sheath of FIG. 1;

FIG. 3 is a plan view of a rear end of the outer sheath of FIG. 1;

FIG. 4 is a top plan view of the outer sheath of FIG. 1; and,

FIG. 5 is a bottom plan view of the outer sheath of FIG. 1.

The broken lines in the drawings illustrate portions of the outer sheath and form no part of the claimed design. 

CLAIM The ornamental design for an outer sheath, as shown and described. 